Fluid flow rate measuring circuit
AssigneeMcMillan Company
InventorsRobert D. McMillan, Robert M. McMillan
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Abstract
A turbine wheel flow measuring transducer is provided for measuring low flow rates of corrosive fluids, whether fluids or gases. The transducer has a turbine wheel rotating in a housing fluid chamber at a rate set by the corrosive fluid flowing through the housing. Infrared light passing through the fluid is sensed and converted by an optical flow measurement circuit. The amount of light which passes through a rotating turbine wheel indicates flow rate. A processing circuit forms output signals indicative of fluid flow rate.
Claims12
An optical flow measurement circuit for forming an electrical signal indicative of fluid flow, comprising:
- a light source mounted for emitting light to pass through the fluid;
- a light detector in optical alignment with said light source to sense the amount of light passing through the fluid;
- and
- a pulsed power source for energizing said light source at a duty cycle of about ten percent to thereby reduce power consumption.
Dependencies are inferred from the claim text.